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Cell division during skin cancer. Illustration of a vertical cross-section through skin, showing the cell layers and cell division during cancer. Across bottom is connective tissue (yellow). The first layer of cells above the connective tissue is the basal layer. Above that is the differentiation zone. At top is the outer layer of differentiated keratinised skin cells. Here, in addition to cell division (chromosomes, green) in the basal layer, cells are dividing in an uncontrolled fashion, into undifferentiated irregular shapes, and migrating to invade other tissues. For a set of images showing cell division in normal, wounded and cancerous skin, see images C023/8583 to C023/8585.
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